ISMRM 25th Annual Meeting & Exhibition

ISMRM 25th Annual Meeting & Exhibition • 22-27 April 2017 • Honolulu, HI, USA

Weekend Educational Course: RF Engineering: Coils

Weekend Course

ORGANIZERS: Gregor Adriany, Ph.D. , Mary P. McDougall, Ph.D. & Graham C. Wiggins, D.Phil.

Sunday, 23 April 2017

Room 313A

08:30 - 12:00

Moderators: Ryan Brown, Hiroyuki Fujita

Skill Level: Intermediate

Slack Channel: #e_phys_eng
Session Number: WE15

Overview
Attendees will receive relevant session and talk recommendations from speakers In this one-day course, the principles of RF coils used to detect and excite the MR signals will be discussed, beginning with the transmission lines that interconnect the coils to the MR system, and extending to single surface and volume coils and finally RF coil arrays for both transmit and receive. A discussion of the RF modeling tools used to analyze these coils and coil arrays, and their interaction with the patient and the environment will lead into the interaction of RF fields with other objects in the MR environment.

Target Audience
This course is designed for MR technicians, scientists and engineers with an interest in understanding physical principles behind MR safety issues related to RF fields, and/or the construction, design or use of RF coils and RF coil arrays.

Educational Objectives
Upon completion of this course, participants should be able to:
-Describe the basic theory, design and construction of single and multi-tuned RF coils and their feed networks;
-Illustrate the principles of operation and basic applications of receive and transmit RF coil arrays; and
-Compare the major methods of RF modeling commonly in use and the relative advantages and disadvantages of each.

08:30	Basics of Transmission Lines & Power Transfer Natalia Gudino Fundamentals of transmission lines and power transfer are presented to help in the understanding, design, implementation and performance evaluation of MRI hardware.
09:00	Volume & Surface Coils Christoph Leussler RF coils (antennas) for MRI are designed to generate a RF magnetic field inside the patient. Large body volume coils are optimized for the generation of a homogeneous RF magnetic field. Local surface coils are designed to provide high signal to noise ratio. Different designs and related physical aspects are discussed.
09:30	Multi-Tuned Coils Nikolai Avdievich X-nuclei (¹³C, ³¹P, ¹⁹F etc) MRI and spectroscopy are of great interest since these methods provide a non-invasive technique to study in-vivo metabolite changes due to various diseases. To provide anatomical landmarks for interpretation of X-nuclei spectroscopic data, ¹H anatomical images are required. To eliminate uncertainties associated with repositioning the patient, the RF coil must also resonate at the ¹H frequency. This technique is called double-tuning (DT) of the RF coils. The choice of DT design is determined by the requirements of a specific application. Various methods of constructing DT RF surface coils, volume coils, and phased arrays are discussed.
10:00	Break & Meet the Teachers
10:30	Receive Arrays & Circuitry Boris Keil
11:00	Transmit Arrays & Circuitry Stephan Orzada As the main magnetic field strength increases, the corresponding RF wavelength is shortened. This leads to pronounced wave effects in the transmit field, causing inhomogeneous excitation. Multi-channel arrays provide additional degrees of freedom to mitigate such effects and to manipulate (or to tailor) RF transmission. Roughly these can be divided in 3 types, namely local arrays, remote circumferential arrays and travelling wave arrays. Examples of these arrays are presented in this educational talk.
11:30	RF Modelling Mikhail Kozlov
12:00	Break & Meet the Teachers

Weekend Course

ORGANIZERS: Gregor Adriany, Ph.D. , Mary P. McDougall, Ph.D. & Graham C. Wiggins, D.Phil.

Sunday, 23 April 2017

Room 313A

14:00 - 16:15

Moderators: Ryan Brown, Hiroyuki Fujita

Skill Level: Intermediate

Slack Channel: #e_phys_eng
Session Number: WE15

Overview
Attendees will receive relevant session and talk recommendations from speakers In this one-day course, the principles of RF coils used to detect and excite the MR signals will be discussed, beginning with the transmission lines that interconnect the coils to the MR system, and extending to single surface and volume coils and finally RF coil arrays for both transmit and receive. A discussion of the RF modeling tools used to analyze these coils and coil arrays, and their interaction with the patient and the environment will lead into the interaction of RF fields with other objects in the MR environment.

Target Audience
This course is designed for MR technicians, scientists and engineers with an interest in understanding physical principles behind MR safety issues related to RF fields, and/or the construction, design or use of RF coils and RF coil arrays.

Educational Objectives
Upon completion of this course, participants should be able to:

-Describe the basic theory, design and construction of single and multi-tuned RF coils and their feed networks;
-Illustrate the principles of operation and basic applications of receive and transmit RF coil arrays; and
-Compare the major methods of RF modeling commonly in use and the relative advantages and disadvantages of each.

14:00	Dielectric Materials & Resonators Qing Yang, Chris Sica This talk will review and explain the dielectric effects in MRI using simple examples. Its applications in enhancing RF field using ultrahigh dielectric constant materials at 1.5T, 3T and 7T will be presented.
14:30	UHF Coil & Array Design - permission withheld Karthik Lakshmanan
15:00	Break & Meet the Teachers
15:30	Construction of Rx Arrays Shajan Gunamony, Jonas Bause We aim to present a step-by-step method to construct a transmit array. The measurements will be demonstrated using an 8-channel transmit array. We will then extend this method to the development of a dual-row transmit array. Construction and charecterisation of a receive coil element and combining a transmit and recieve array is also included.
16:15	Adjournment

The International Society for Magnetic Resonance in Medicine is accredited by the Accreditation Council for
Continuing Medical Education to provide continuing medical education for physicians.